40019968 has 24 divisors (see below), whose sum is σ = 80024490. Its totient is φ = 20008960.

The previous prime is 40019957. The next prime is 40019981. The reversal of 40019968 is 86991004.

It can be written as a sum of positive squares in only one way, i.e., 37356544 + 2663424 = 6112^2 + 1632^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7723 + ... + 11818.

Almost surely, 2^40019968 is an apocalyptic number.

It is an amenable number.

40019968 is a deficient number, since it is larger than the sum of its proper divisors (40004522).

40019968 is an equidigital number, since it uses as much as digits as its factorization.

40019968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19563 (or 19543 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 40019968 is about 6326.1337323835. The cubic root of 40019968 is about 342.0520878680.

Subtracting from 40019968 its sum of digits (37), we obtain a triangular number (40019931 = T₈₉₄₆).

It can be divided in two parts, 4001996 and 8, that added together give a palindrome (4002004).

The spelling of 40019968 in words is "forty million, nineteen thousand, nine hundred sixty-eight".